Malicious PDF — malware analysis report

Static analysis result for SHA-256 83551ed538e2f9d0…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 15:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3006d0b8e798a7eabfb4aca473fe8d33 SHA-1: b73704ebc9592ddc945142e799f633b53d29daad SHA-256: 83551ed538e2f9d04fa1aae177764896912464e38e37d4bbcabdba6a55c26e24
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though partially obfuscated, includes the same malicious URL and benign-looking PDF titles, suggesting a link farm or SEO poisoning tactic to lure victims. The ML classifier strongly indicates maliciousness, and the presence of many external links points towards an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=atharvashirsha+ganpati+marathi+pdf In PDF document text
    • http://files.mycdaclass-unit8.com/uploads/1/3/1/4/131453698/dekeganojenak_vuvibakexo_kopawajotis.pdfIn PDF document text
    • http://files.laurawebber.com/uploads/1/3/0/8/130873992/7807e64062.pdfIn PDF document text
    • http://files.neworleansfishingadventures.com/uploads/1/3/1/8/131856949/nuwoniluxe.pdfIn PDF document text
    • http://files.futureomro.org/uploads/1/3/1/6/131607522/romuparedosum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8589/6609/files/gauss_jordan_method.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/sotivigonoxerepoxemewido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4389/4934/files/83448652636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/9421869720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jidaxuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8109/5581/files/the_hobbit_the_desolation_of_smaug_123movies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2020/6758/files/jogelanavipevisukifama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4901/7756/files/81909790735.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/salesman_resume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9411/4455/files/english_reading_lessons_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7229/8918/files/36416981887.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0906/4607/files/maplestory_demon_avenger.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6359 5472 bytes
SHA-256: 5c4212ec26518d748839f71887c9e6b11489e1267c7e8cb2c5b3e5a6642dadaa
font_01_sfnt_off000075d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75D1 9864 bytes
SHA-256: 65182d510808c646e59b7705918c373c4b85b70f717855614da372f2bf1d464b
font_02_sfnt_off000097dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97DD 3560 bytes
SHA-256: 7ac448c9080533aad7bbe37672b5251c5469e3db4ee9a023493941180876b067